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High-amplitude pressure fluctuations of a pump-turbine with large head variable ratio during the turbine load rejection process

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Abstract

Large-head variable-amplitude pump turbines (PTs) encounter serious transient hydraulic instability issues. To explore the evolution mechanisms of pressure fluctuations (PFs) and flow patterns inside large-head variable-amplitude PTs, the load rejection process (LRP) was investigated using a one- and three-dimensional coupled flow simulation approach. The temporal, spatial, and frequency characteristics of the fluctuating pressures were analyzed for four monitoring points using a combined time-frequency analysis approach. The results indicated that PFs during the LRP of large-head variable-amplitude PTs had a new fluctuation frequency component related to Dean vortices (DVs) in the volute, in addition to the common fluctuation frequency components related to rotor-stator interaction phenomena and local backflow vortices near the impeller inlet. The PF frequency component existed throughout the LRP and had a significant influence on the transient maximum pressure at the volute end. This study provides a useful theoretical guide for the design and optimization of large-head variable-amplitude PTs.

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Authors and Affiliations

  1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    XiaoLong Fu, DeYou Li, YeChen Song & HongJie Wang

  2. State Key Laboratory of Hydro-Power Equipment, Harbin Institute of Large Electrical Machinery, Harbin, 150040, China

    XianZhu Wei

Authors
  1. XiaoLong Fu
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  2. DeYou Li
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  3. YeChen Song
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  4. HongJie Wang
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  5. XianZhu Wei
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Corresponding authors

Correspondence to DeYou Li or HongJie Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52209108 and 52079034), Sichuan Science and Technology Program (Grant No. 2023YFQ0021), the Natural Science Foundation of Heilongjiang Province, China (Grant No. LH2023E058), and China Postdoctoral Science Foundation (Grant No. 2022M720948).

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Fu, X., Li, D., Song, Y. et al. High-amplitude pressure fluctuations of a pump-turbine with large head variable ratio during the turbine load rejection process. Sci. China Technol. Sci. 66, 2575–2585 (2023). https://doi.org/10.1007/s11431-022-2322-9

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  • DOI: https://doi.org/10.1007/s11431-022-2322-9

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